Piston-rod packing.



No. 642,4". Patented Jan. 30, I900. a. F. ALLEN.

- PISTON ROD PACKING.

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(No Model.)

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aeor y'e 2 7 m h oiZZe/a NITED STATES GEORGE FRANKLIN ALLEN, OF ST.LOUIS, MISSOURI, ASSIGNOR TO THE HOYT METAL COMPANY, OF SAME PLACE.

PISTON-ROD PACKING.

SPECIFICATION forming part of Letters Patent No. 642,411, dated January30, 1900.

Application filed March 20,1899- To all whom, it may concern:

Be it known that I, GEORGE FRANKLIN AL- LEN, a citizen of the UnitedStates, residing at the city of St. Louis, in the State of Missouri,have invented certain new and useful Improvements in Piston-RodPackings, of which the following is a full, clear, and. exactdescription, reference being had to the accom panying drawings, formingpart of this specie fication.

My invention relates to an improvement in piston-rod packin gs, and hasspecial reference to the elastic packing-rings situated between metallicpacking-rings; and my invention consists in features of noveltyhereinafter fully described, and pointed out in the claim.

Figure I is a longitudinal sectional view taken through a packing-boxwith my improved packing shown therein. Fig. II is a perspective view ofone of theelastic packin g-rings constituting the main feature of myimprovement. Fig. III is a cross-sectional View through the ring shownin Fig. II.

1 designates a piston-rod mounted in a packing-box 2, provided with agland 3.

4 designates metallic packing-rings of sectional form, the members ofwhich are held together by retaining-wires 5, occupying seats at thesurfaces of said rings.

6 designates the bodies of elastic packingrings seated between themetallic rings 4:,these elastic rings being preferably of approximatelyV shape in cross-section, and the body 6 is preferably of rubber, andtheir narrowest portions are designed to lie in contact with the pistonrod 1. The body 6 is covered upon its two converging sides and at itsinner narrow edge with a covering 7, of asbestos,

that confines the said body and prevents the Serial No. 709,734. (Nomodel.)

material of the body from spreading within said covering. The outersurface of each elastic ring is uninclosed by said covering, andtherefore is free to spread and fill any interstices within thepacking-box, which it is rendered more efficient in accomplishing byreason of the body 6 being confined at its sides by the covering 7. Theelastic ring is separated on a line 8 (see Fig. 11) to allow of itsready application to the piston-rod.

The elastic rings being confined at their sides and inner edges by theinclosing covering there is no possibility of the elastic body beingpressed between the metallic rings and piston-rod to clog the action ofsaid rod; but instead the elastic body is forced outward at theuninclosed outer surface of each ring to effectually fill the interiorof the box and force the interposed metallic rings to the pistonrod. Itwill therefore be seen that the bearing-contact with the piston-rod isentirely metallic, while the elastic rings form cushions between themetallic bearing-rings.

I claim as my invention- In a piston-rod packing, the combination with abox, of sectional metallic rings located therein, and elastic ringslocated between said metallic rings of V shape in transverse section,said elastic rings each comprising an elastic body havinginwardly-converging sides and a narrowinner edge and a covering ofasbestos inclosing the said sides and the inner edge only of saidelastic ring,'substantially as described.

GEORGE FRANKLIN ALLEN.

In presence of- E. S. KNIGHT, N. V. ALEXANDER.

